/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

(function (mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function (CodeMirror) {
  "use strict";

  function expressionAllowed(stream, state, backUp) {
    return /^(?:operator|sof|keyword c|case|new|export|default|[\[{}\(,;:]|=>)$/.test(state.lastType) ||
      (state.lastType == "quasi" && /\{\s*$/.test(stream.string.slice(0, stream.pos - (backUp || 0))))
  }

  CodeMirror.defineMode("javascript", function (config, parserConfig) {
    var indentUnit = config.indentUnit;
    var statementIndent = parserConfig.statementIndent;
    var jsonldMode = parserConfig.jsonld;
    var jsonMode = parserConfig.json || jsonldMode;
    var isTS = parserConfig.typescript;
    var wordRE = parserConfig.wordCharacters || /[\w$\xa1-\uffff]/;

    // Tokenizer

    var keywords = function () {
      function kw(type) {
        return {type: type, style: "keyword"};
      }

      var A = kw("keyword a"), B = kw("keyword b"), C = kw("keyword c");
      var operator = kw("operator"), atom = {type: "atom", style: "atom"};

      var jsKeywords = {
        "if": kw("if"), "while": A, "with": A, "else": B, "do": B, "try": B, "finally": B,
        "return": C, "break": C, "continue": C, "new": kw("new"), "delete": C, "throw": C, "debugger": C,
        "var": kw("var"), "const": kw("var"), "let": kw("var"),
        "function": kw("function"), "catch": kw("catch"),
        "for": kw("for"), "switch": kw("switch"), "case": kw("case"), "default": kw("default"),
        "in": operator, "typeof": operator, "instanceof": operator,
        "true": atom, "false": atom, "null": atom, "undefined": atom, "NaN": atom, "Infinity": atom,
        "this": kw("this"), "class": kw("class"), "super": kw("atom"),
        "yield": C, "export": kw("export"), "import": kw("import"), "extends": C,
        "await": C
      };

      // Extend the 'normal' keywords with the TypeScript language extensions
      if (isTS) {
        var type = {type: "variable", style: "type"};
        var tsKeywords = {
          // object-like things
          "interface": kw("class"),
          "implements": C,
          "namespace": C,
          "module": kw("module"),
          "enum": kw("module"),

          // scope modifiers
          "public": kw("modifier"),
          "private": kw("modifier"),
          "protected": kw("modifier"),
          "abstract": kw("modifier"),

          // types
          "string": type, "number": type, "boolean": type, "any": type
        };

        for (var attr in tsKeywords) {
          jsKeywords[attr] = tsKeywords[attr];
        }
      }

      return jsKeywords;
    }();

    var isOperatorChar = /[+\-*&%=<>!?|~^@]/;
    var isJsonldKeyword = /^@(context|id|value|language|type|container|list|set|reverse|index|base|vocab|graph)"/;

    function readRegexp(stream) {
      var escaped = false, next, inSet = false;
      while ((next = stream.next()) != null) {
        if (!escaped) {
          if (next == "/" && !inSet) return;
          if (next == "[") inSet = true;
          else if (inSet && next == "]") inSet = false;
        }
        escaped = !escaped && next == "\\";
      }
    }

    // Used as scratch variables to communicate multiple values without
    // consing up tons of objects.
    var type, content;

    function ret(tp, style, cont) {
      type = tp;
      content = cont;
      return style;
    }

    function tokenBase(stream, state) {
      var ch = stream.next();
      if (ch == '"' || ch == "'") {
        state.tokenize = tokenString(ch);
        return state.tokenize(stream, state);
      } else if (ch == "." && stream.match(/^\d+(?:[eE][+\-]?\d+)?/)) {
        return ret("number", "number");
      } else if (ch == "." && stream.match("..")) {
        return ret("spread", "meta");
      } else if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
        return ret(ch);
      } else if (ch == "=" && stream.eat(">")) {
        return ret("=>", "operator");
      } else if (ch == "0" && stream.eat(/x/i)) {
        stream.eatWhile(/[\da-f]/i);
        return ret("number", "number");
      } else if (ch == "0" && stream.eat(/o/i)) {
        stream.eatWhile(/[0-7]/i);
        return ret("number", "number");
      } else if (ch == "0" && stream.eat(/b/i)) {
        stream.eatWhile(/[01]/i);
        return ret("number", "number");
      } else if (/\d/.test(ch)) {
        stream.match(/^\d*(?:\.\d*)?(?:[eE][+\-]?\d+)?/);
        return ret("number", "number");
      } else if (ch == "/") {
        if (stream.eat("*")) {
          state.tokenize = tokenComment;
          return tokenComment(stream, state);
        } else if (stream.eat("/")) {
          stream.skipToEnd();
          return ret("comment", "comment");
        } else if (expressionAllowed(stream, state, 1)) {
          readRegexp(stream);
          stream.match(/^\b(([gimyu])(?![gimyu]*\2))+\b/);
          return ret("regexp", "string-2");
        } else {
          stream.eatWhile(isOperatorChar);
          return ret("operator", "operator", stream.current());
        }
      } else if (ch == "`") {
        state.tokenize = tokenQuasi;
        return tokenQuasi(stream, state);
      } else if (ch == "#") {
        stream.skipToEnd();
        return ret("error", "error");
      } else if (isOperatorChar.test(ch)) {
        if (ch != ">" || !state.lexical || state.lexical.type != ">")
          stream.eatWhile(isOperatorChar);
        return ret("operator", "operator", stream.current());
      } else if (wordRE.test(ch)) {
        stream.eatWhile(wordRE);
        var word = stream.current()
        if (state.lastType != ".") {
          if (keywords.propertyIsEnumerable(word)) {
            var kw = keywords[word]
            return ret(kw.type, kw.style, word)
          }
          if (word == "async" && stream.match(/^\s*[\(\w]/, false))
            return ret("async", "keyword", word)
        }
        return ret("variable", "variable", word)
      }
    }

    function tokenString(quote) {
      return function (stream, state) {
        var escaped = false, next;
        if (jsonldMode && stream.peek() == "@" && stream.match(isJsonldKeyword)) {
          state.tokenize = tokenBase;
          return ret("jsonld-keyword", "meta");
        }
        while ((next = stream.next()) != null) {
          if (next == quote && !escaped) break;
          escaped = !escaped && next == "\\";
        }
        if (!escaped) state.tokenize = tokenBase;
        return ret("string", "string");
      };
    }

    function tokenComment(stream, state) {
      var maybeEnd = false, ch;
      while (ch = stream.next()) {
        if (ch == "/" && maybeEnd) {
          state.tokenize = tokenBase;
          break;
        }
        maybeEnd = (ch == "*");
      }
      return ret("comment", "comment");
    }

    function tokenQuasi(stream, state) {
      var escaped = false, next;
      while ((next = stream.next()) != null) {
        if (!escaped && (next == "`" || next == "$" && stream.eat("{"))) {
          state.tokenize = tokenBase;
          break;
        }
        escaped = !escaped && next == "\\";
      }
      return ret("quasi", "string-2", stream.current());
    }

    var brackets = "([{}])";
    // This is a crude lookahead trick to try and notice that we're
    // parsing the argument patterns for a fat-arrow function before we
    // actually hit the arrow token. It only works if the arrow is on
    // the same line as the arguments and there's no strange noise
    // (comments) in between. Fallback is to only notice when we hit the
    // arrow, and not declare the arguments as locals for the arrow
    // body.
    function findFatArrow(stream, state) {
      if (state.fatArrowAt) state.fatArrowAt = null;
      var arrow = stream.string.indexOf("=>", stream.start);
      if (arrow < 0) return;

      if (isTS) { // Try to skip TypeScript return type declarations after the arguments
        var m = /:\s*(?:\w+(?:<[^>]*>|\[\])?|\{[^}]*\})\s*$/.exec(stream.string.slice(stream.start, arrow))
        if (m) arrow = m.index
      }

      var depth = 0, sawSomething = false;
      for (var pos = arrow - 1; pos >= 0; --pos) {
        var ch = stream.string.charAt(pos);
        var bracket = brackets.indexOf(ch);
        if (bracket >= 0 && bracket < 3) {
          if (!depth) {
            ++pos;
            break;
          }
          if (--depth == 0) {
            if (ch == "(") sawSomething = true;
            break;
          }
        } else if (bracket >= 3 && bracket < 6) {
          ++depth;
        } else if (wordRE.test(ch)) {
          sawSomething = true;
        } else if (/["'\/]/.test(ch)) {
          return;
        } else if (sawSomething && !depth) {
          ++pos;
          break;
        }
      }
      if (sawSomething && !depth) state.fatArrowAt = pos;
    }

    // Parser

    var atomicTypes = {
      "atom": true,
      "number": true,
      "variable": true,
      "string": true,
      "regexp": true,
      "this": true,
      "jsonld-keyword": true
    };

    function JSLexical(indented, column, type, align, prev, info) {
      this.indented = indented;
      this.column = column;
      this.type = type;
      this.prev = prev;
      this.info = info;
      if (align != null) this.align = align;
    }

    function inScope(state, varname) {
      for (var v = state.localVars; v; v = v.next)
        if (v.name == varname) return true;
      for (var cx = state.context; cx; cx = cx.prev) {
        for (var v = cx.vars; v; v = v.next)
          if (v.name == varname) return true;
      }
    }

    function parseJS(state, style, type, content, stream) {
      var cc = state.cc;
      // Communicate our context to the combinators.
      // (Less wasteful than consing up a hundred closures on every call.)
      cx.state = state;
      cx.stream = stream;
      cx.marked = null, cx.cc = cc;
      cx.style = style;

      if (!state.lexical.hasOwnProperty("align"))
        state.lexical.align = true;

      while (true) {
        var combinator = cc.length ? cc.pop() : jsonMode ? expression : statement;
        if (combinator(type, content)) {
          while (cc.length && cc[cc.length - 1].lex)
            cc.pop()();
          if (cx.marked) return cx.marked;
          if (type == "variable" && inScope(state, content)) return "variable-2";
          return style;
        }
      }
    }

    // Combinator utils

    var cx = {state: null, column: null, marked: null, cc: null};

    function pass() {
      for (var i = arguments.length - 1; i >= 0; i--) cx.cc.push(arguments[i]);
    }

    function cont() {
      pass.apply(null, arguments);
      return true;
    }

    function register(varname) {
      function inList(list) {
        for (var v = list; v; v = v.next)
          if (v.name == varname) return true;
        return false;
      }

      var state = cx.state;
      cx.marked = "def";
      if (state.context) {
        if (inList(state.localVars)) return;
        state.localVars = {name: varname, next: state.localVars};
      } else {
        if (inList(state.globalVars)) return;
        if (parserConfig.globalVars)
          state.globalVars = {name: varname, next: state.globalVars};
      }
    }

    // Combinators

    var defaultVars = {name: "this", next: {name: "arguments"}};

    function pushcontext() {
      cx.state.context = {prev: cx.state.context, vars: cx.state.localVars};
      cx.state.localVars = defaultVars;
    }

    function popcontext() {
      cx.state.localVars = cx.state.context.vars;
      cx.state.context = cx.state.context.prev;
    }

    function pushlex(type, info) {
      var result = function () {
        var state = cx.state, indent = state.indented;
        if (state.lexical.type == "stat") indent = state.lexical.indented;
        else for (var outer = state.lexical; outer && outer.type == ")" && outer.align; outer = outer.prev)
          indent = outer.indented;
        state.lexical = new JSLexical(indent, cx.stream.column(), type, null, state.lexical, info);
      };
      result.lex = true;
      return result;
    }

    function poplex() {
      var state = cx.state;
      if (state.lexical.prev) {
        if (state.lexical.type == ")")
          state.indented = state.lexical.indented;
        state.lexical = state.lexical.prev;
      }
    }

    poplex.lex = true;

    function expect(wanted) {
      function exp(type) {
        if (type == wanted) return cont();
        else if (wanted == ";") return pass();
        else return cont(exp);
      };
      return exp;
    }

    function statement(type, value) {
      if (type == "var") return cont(pushlex("vardef", value.length), vardef, expect(";"), poplex);
      if (type == "keyword a") return cont(pushlex("form"), parenExpr, statement, poplex);
      if (type == "keyword b") return cont(pushlex("form"), statement, poplex);
      if (type == "{") return cont(pushlex("}"), block, poplex);
      if (type == ";") return cont();
      if (type == "if") {
        if (cx.state.lexical.info == "else" && cx.state.cc[cx.state.cc.length - 1] == poplex)
          cx.state.cc.pop()();
        return cont(pushlex("form"), parenExpr, statement, poplex, maybeelse);
      }
      if (type == "function") return cont(functiondef);
      if (type == "for") return cont(pushlex("form"), forspec, statement, poplex);
      if (type == "variable") {
        if (isTS && value == "type") {
          cx.marked = "keyword"
          return cont(typeexpr, expect("operator"), typeexpr, expect(";"));
        } else {
          return cont(pushlex("stat"), maybelabel);
        }
      }
      if (type == "switch") return cont(pushlex("form"), parenExpr, expect("{"), pushlex("}", "switch"),
        block, poplex, poplex);
      if (type == "case") return cont(expression, expect(":"));
      if (type == "default") return cont(expect(":"));
      if (type == "catch") return cont(pushlex("form"), pushcontext, expect("("), funarg, expect(")"),
        statement, poplex, popcontext);
      if (type == "class") return cont(pushlex("form"), className, poplex);
      if (type == "export") return cont(pushlex("stat"), afterExport, poplex);
      if (type == "import") return cont(pushlex("stat"), afterImport, poplex);
      if (type == "module") return cont(pushlex("form"), pattern, expect("{"), pushlex("}"), block, poplex, poplex)
      if (type == "async") return cont(statement)
      if (value == "@") return cont(expression, statement)
      return pass(pushlex("stat"), expression, expect(";"), poplex);
    }

    function expression(type) {
      return expressionInner(type, false);
    }

    function expressionNoComma(type) {
      return expressionInner(type, true);
    }

    function parenExpr(type) {
      if (type != "(") return pass()
      return cont(pushlex(")"), expression, expect(")"), poplex)
    }

    function expressionInner(type, noComma) {
      if (cx.state.fatArrowAt == cx.stream.start) {
        var body = noComma ? arrowBodyNoComma : arrowBody;
        if (type == "(") return cont(pushcontext, pushlex(")"), commasep(pattern, ")"), poplex, expect("=>"), body, popcontext);
        else if (type == "variable") return pass(pushcontext, pattern, expect("=>"), body, popcontext);
      }

      var maybeop = noComma ? maybeoperatorNoComma : maybeoperatorComma;
      if (atomicTypes.hasOwnProperty(type)) return cont(maybeop);
      if (type == "function") return cont(functiondef, maybeop);
      if (type == "class") return cont(pushlex("form"), classExpression, poplex);
      if (type == "keyword c" || type == "async") return cont(noComma ? maybeexpressionNoComma : maybeexpression);
      if (type == "(") return cont(pushlex(")"), maybeexpression, expect(")"), poplex, maybeop);
      if (type == "operator" || type == "spread") return cont(noComma ? expressionNoComma : expression);
      if (type == "[") return cont(pushlex("]"), arrayLiteral, poplex, maybeop);
      if (type == "{") return contCommasep(objprop, "}", null, maybeop);
      if (type == "quasi") return pass(quasi, maybeop);
      if (type == "new") return cont(maybeTarget(noComma));
      return cont();
    }

    function maybeexpression(type) {
      if (type.match(/[;\}\)\],]/)) return pass();
      return pass(expression);
    }

    function maybeexpressionNoComma(type) {
      if (type.match(/[;\}\)\],]/)) return pass();
      return pass(expressionNoComma);
    }

    function maybeoperatorComma(type, value) {
      if (type == ",") return cont(expression);
      return maybeoperatorNoComma(type, value, false);
    }

    function maybeoperatorNoComma(type, value, noComma) {
      var me = noComma == false ? maybeoperatorComma : maybeoperatorNoComma;
      var expr = noComma == false ? expression : expressionNoComma;
      if (type == "=>") return cont(pushcontext, noComma ? arrowBodyNoComma : arrowBody, popcontext);
      if (type == "operator") {
        if (/\+\+|--/.test(value)) return cont(me);
        if (value == "?") return cont(expression, expect(":"), expr);
        return cont(expr);
      }
      if (type == "quasi") {
        return pass(quasi, me);
      }
      if (type == ";") return;
      if (type == "(") return contCommasep(expressionNoComma, ")", "call", me);
      if (type == ".") return cont(property, me);
      if (type == "[") return cont(pushlex("]"), maybeexpression, expect("]"), poplex, me);
      if (isTS && value == "as") {
        cx.marked = "keyword";
        return cont(typeexpr, me)
      }
    }

    function quasi(type, value) {
      if (type != "quasi") return pass();
      if (value.slice(value.length - 2) != "${") return cont(quasi);
      return cont(expression, continueQuasi);
    }

    function continueQuasi(type) {
      if (type == "}") {
        cx.marked = "string-2";
        cx.state.tokenize = tokenQuasi;
        return cont(quasi);
      }
    }

    function arrowBody(type) {
      findFatArrow(cx.stream, cx.state);
      return pass(type == "{" ? statement : expression);
    }

    function arrowBodyNoComma(type) {
      findFatArrow(cx.stream, cx.state);
      return pass(type == "{" ? statement : expressionNoComma);
    }

    function maybeTarget(noComma) {
      return function (type) {
        if (type == ".") return cont(noComma ? targetNoComma : target);
        else return pass(noComma ? expressionNoComma : expression);
      };
    }

    function target(_, value) {
      if (value == "target") {
        cx.marked = "keyword";
        return cont(maybeoperatorComma);
      }
    }

    function targetNoComma(_, value) {
      if (value == "target") {
        cx.marked = "keyword";
        return cont(maybeoperatorNoComma);
      }
    }

    function maybelabel(type) {
      if (type == ":") return cont(poplex, statement);
      return pass(maybeoperatorComma, expect(";"), poplex);
    }

    function property(type) {
      if (type == "variable") {
        cx.marked = "property";
        return cont();
      }
    }

    function objprop(type, value) {
      if (type == "async") {
        cx.marked = "property";
        return cont(objprop);
      } else if (type == "variable" || cx.style == "keyword") {
        cx.marked = "property";
        if (value == "get" || value == "set") return cont(getterSetter);
        return cont(afterprop);
      } else if (type == "number" || type == "string") {
        cx.marked = jsonldMode ? "property" : (cx.style + " property");
        return cont(afterprop);
      } else if (type == "jsonld-keyword") {
        return cont(afterprop);
      } else if (type == "modifier") {
        return cont(objprop)
      } else if (type == "[") {
        return cont(expression, expect("]"), afterprop);
      } else if (type == "spread") {
        return cont(expression, afterprop);
      } else if (type == ":") {
        return pass(afterprop)
      }
    }

    function getterSetter(type) {
      if (type != "variable") return pass(afterprop);
      cx.marked = "property";
      return cont(functiondef);
    }

    function afterprop(type) {
      if (type == ":") return cont(expressionNoComma);
      if (type == "(") return pass(functiondef);
    }

    function commasep(what, end, sep) {
      function proceed(type, value) {
        if (sep ? sep.indexOf(type) > -1 : type == ",") {
          var lex = cx.state.lexical;
          if (lex.info == "call") lex.pos = (lex.pos || 0) + 1;
          return cont(function (type, value) {
            if (type == end || value == end) return pass()
            return pass(what)
          }, proceed);
        }
        if (type == end || value == end) return cont();
        return cont(expect(end));
      }

      return function (type, value) {
        if (type == end || value == end) return cont();
        return pass(what, proceed);
      };
    }

    function contCommasep(what, end, info) {
      for (var i = 3; i < arguments.length; i++)
        cx.cc.push(arguments[i]);
      return cont(pushlex(end, info), commasep(what, end), poplex);
    }

    function block(type) {
      if (type == "}") return cont();
      return pass(statement, block);
    }

    function maybetype(type, value) {
      if (isTS) {
        if (type == ":") return cont(typeexpr);
        if (value == "?") return cont(maybetype);
      }
    }

    function typeexpr(type) {
      if (type == "variable") {
        cx.marked = "type";
        return cont(afterType);
      }
      if (type == "string" || type == "number" || type == "atom") return cont(afterType);
      if (type == "{") return cont(pushlex("}"), commasep(typeprop, "}", ",;"), poplex, afterType)
      if (type == "(") return cont(commasep(typearg, ")"), maybeReturnType)
    }

    function maybeReturnType(type) {
      if (type == "=>") return cont(typeexpr)
    }

    function typeprop(type, value) {
      if (type == "variable" || cx.style == "keyword") {
        cx.marked = "property"
        return cont(typeprop)
      } else if (value == "?") {
        return cont(typeprop)
      } else if (type == ":") {
        return cont(typeexpr)
      } else if (type == "[") {
        return cont(expression, maybetype, expect("]"), typeprop)
      }
    }

    function typearg(type) {
      if (type == "variable") return cont(typearg)
      else if (type == ":") return cont(typeexpr)
    }

    function afterType(type, value) {
      if (value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, afterType)
      if (value == "|" || type == ".") return cont(typeexpr)
      if (type == "[") return cont(expect("]"), afterType)
      if (value == "extends") return cont(typeexpr)
    }

    function vardef() {
      return pass(pattern, maybetype, maybeAssign, vardefCont);
    }

    function pattern(type, value) {
      if (type == "modifier") return cont(pattern)
      if (type == "variable") {
        register(value);
        return cont();
      }
      if (type == "spread") return cont(pattern);
      if (type == "[") return contCommasep(pattern, "]");
      if (type == "{") return contCommasep(proppattern, "}");
    }

    function proppattern(type, value) {
      if (type == "variable" && !cx.stream.match(/^\s*:/, false)) {
        register(value);
        return cont(maybeAssign);
      }
      if (type == "variable") cx.marked = "property";
      if (type == "spread") return cont(pattern);
      if (type == "}") return pass();
      return cont(expect(":"), pattern, maybeAssign);
    }

    function maybeAssign(_type, value) {
      if (value == "=") return cont(expressionNoComma);
    }

    function vardefCont(type) {
      if (type == ",") return cont(vardef);
    }

    function maybeelse(type, value) {
      if (type == "keyword b" && value == "else") return cont(pushlex("form", "else"), statement, poplex);
    }

    function forspec(type) {
      if (type == "(") return cont(pushlex(")"), forspec1, expect(")"), poplex);
    }

    function forspec1(type) {
      if (type == "var") return cont(vardef, expect(";"), forspec2);
      if (type == ";") return cont(forspec2);
      if (type == "variable") return cont(formaybeinof);
      return pass(expression, expect(";"), forspec2);
    }

    function formaybeinof(_type, value) {
      if (value == "in" || value == "of") {
        cx.marked = "keyword";
        return cont(expression);
      }
      return cont(maybeoperatorComma, forspec2);
    }

    function forspec2(type, value) {
      if (type == ";") return cont(forspec3);
      if (value == "in" || value == "of") {
        cx.marked = "keyword";
        return cont(expression);
      }
      return pass(expression, expect(";"), forspec3);
    }

    function forspec3(type) {
      if (type != ")") cont(expression);
    }

    function functiondef(type, value) {
      if (value == "*") {
        cx.marked = "keyword";
        return cont(functiondef);
      }
      if (type == "variable") {
        register(value);
        return cont(functiondef);
      }
      if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, maybetype, statement, popcontext);
      if (isTS && value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, functiondef)
    }

    function funarg(type) {
      if (type == "spread") return cont(funarg);
      return pass(pattern, maybetype, maybeAssign);
    }

    function classExpression(type, value) {
      // Class expressions may have an optional name.
      if (type == "variable") return className(type, value);
      return classNameAfter(type, value);
    }

    function className(type, value) {
      if (type == "variable") {
        register(value);
        return cont(classNameAfter);
      }
    }

    function classNameAfter(type, value) {
      if (value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, classNameAfter)
      if (value == "extends" || value == "implements" || (isTS && type == ","))
        return cont(isTS ? typeexpr : expression, classNameAfter);
      if (type == "{") return cont(pushlex("}"), classBody, poplex);
    }

    function classBody(type, value) {
      if (type == "variable" || cx.style == "keyword") {
        if ((value == "async" || value == "static" || value == "get" || value == "set" ||
          (isTS && (value == "public" || value == "private" || value == "protected" || value == "readonly" || value == "abstract"))) &&
          cx.stream.match(/^\s+[\w$\xa1-\uffff]/, false)) {
          cx.marked = "keyword";
          return cont(classBody);
        }
        cx.marked = "property";
        return cont(isTS ? classfield : functiondef, classBody);
      }
      if (type == "[")
        return cont(expression, expect("]"), isTS ? classfield : functiondef, classBody)
      if (value == "*") {
        cx.marked = "keyword";
        return cont(classBody);
      }
      if (type == ";") return cont(classBody);
      if (type == "}") return cont();
      if (value == "@") return cont(expression, classBody)
    }

    function classfield(type, value) {
      if (value == "?") return cont(classfield)
      if (type == ":") return cont(typeexpr, maybeAssign)
      if (value == "=") return cont(expressionNoComma)
      return pass(functiondef)
    }

    function afterExport(type, value) {
      if (value == "*") {
        cx.marked = "keyword";
        return cont(maybeFrom, expect(";"));
      }
      if (value == "default") {
        cx.marked = "keyword";
        return cont(expression, expect(";"));
      }
      if (type == "{") return cont(commasep(exportField, "}"), maybeFrom, expect(";"));
      return pass(statement);
    }

    function exportField(type, value) {
      if (value == "as") {
        cx.marked = "keyword";
        return cont(expect("variable"));
      }
      if (type == "variable") return pass(expressionNoComma, exportField);
    }

    function afterImport(type) {
      if (type == "string") return cont();
      return pass(importSpec, maybeMoreImports, maybeFrom);
    }

    function importSpec(type, value) {
      if (type == "{") return contCommasep(importSpec, "}");
      if (type == "variable") register(value);
      if (value == "*") cx.marked = "keyword";
      return cont(maybeAs);
    }

    function maybeMoreImports(type) {
      if (type == ",") return cont(importSpec, maybeMoreImports)
    }

    function maybeAs(_type, value) {
      if (value == "as") {
        cx.marked = "keyword";
        return cont(importSpec);
      }
    }

    function maybeFrom(_type, value) {
      if (value == "from") {
        cx.marked = "keyword";
        return cont(expression);
      }
    }

    function arrayLiteral(type) {
      if (type == "]") return cont();
      return pass(commasep(expressionNoComma, "]"));
    }

    function isContinuedStatement(state, textAfter) {
      return state.lastType == "operator" || state.lastType == "," ||
        isOperatorChar.test(textAfter.charAt(0)) ||
        /[,.]/.test(textAfter.charAt(0));
    }

    // Interface

    return {
      startState: function (basecolumn) {
        var state = {
          tokenize: tokenBase,
          lastType: "sof",
          cc: [],
          lexical: new JSLexical((basecolumn || 0) - indentUnit, 0, "block", false),
          localVars: parserConfig.localVars,
          context: parserConfig.localVars && {vars: parserConfig.localVars},
          indented: basecolumn || 0
        };
        if (parserConfig.globalVars && typeof parserConfig.globalVars == "object")
          state.globalVars = parserConfig.globalVars;
        return state;
      },

      token: function (stream, state) {
        if (stream.sol()) {
          if (!state.lexical.hasOwnProperty("align"))
            state.lexical.align = false;
          state.indented = stream.indentation();
          findFatArrow(stream, state);
        }
        if (state.tokenize != tokenComment && stream.eatSpace()) return null;
        var style = state.tokenize(stream, state);
        if (type == "comment") return style;
        state.lastType = type == "operator" && (content == "++" || content == "--") ? "incdec" : type;
        return parseJS(state, style, type, content, stream);
      },

      indent: function (state, textAfter) {
        if (state.tokenize == tokenComment) return CodeMirror.Pass;
        if (state.tokenize != tokenBase) return 0;
        var firstChar = textAfter && textAfter.charAt(0), lexical = state.lexical, top
        // Kludge to prevent 'maybelse' from blocking lexical scope pops
        if (!/^\s*else\b/.test(textAfter)) for (var i = state.cc.length - 1; i >= 0; --i) {
          var c = state.cc[i];
          if (c == poplex) lexical = lexical.prev;
          else if (c != maybeelse) break;
        }
        while ((lexical.type == "stat" || lexical.type == "form") &&
        (firstChar == "}" || ((top = state.cc[state.cc.length - 1]) &&
          (top == maybeoperatorComma || top == maybeoperatorNoComma) &&
          !/^[,\.=+\-*:?[\(]/.test(textAfter))))
          lexical = lexical.prev;
        if (statementIndent && lexical.type == ")" && lexical.prev.type == "stat")
          lexical = lexical.prev;
        var type = lexical.type, closing = firstChar == type;

        if (type == "vardef") return lexical.indented + (state.lastType == "operator" || state.lastType == "," ? lexical.info + 1 : 0);
        else if (type == "form" && firstChar == "{") return lexical.indented;
        else if (type == "form") return lexical.indented + indentUnit;
        else if (type == "stat")
          return lexical.indented + (isContinuedStatement(state, textAfter) ? statementIndent || indentUnit : 0);
        else if (lexical.info == "switch" && !closing && parserConfig.doubleIndentSwitch != false)
          return lexical.indented + (/^(?:case|default)\b/.test(textAfter) ? indentUnit : 2 * indentUnit);
        else if (lexical.align) return lexical.column + (closing ? 0 : 1);
        else return lexical.indented + (closing ? 0 : indentUnit);
      },

      electricInput: /^\s*(?:case .*?:|default:|\{|\})$/,
      blockCommentStart: jsonMode ? null : "/*",
      blockCommentEnd: jsonMode ? null : "*/",
      lineComment: jsonMode ? null : "//",
      fold: "brace",
      closeBrackets: "()[]{}''\"\"``",

      helperType: jsonMode ? "json" : "javascript",
      jsonldMode: jsonldMode,
      jsonMode: jsonMode,

      expressionAllowed: expressionAllowed,
      skipExpression: function (state) {
        var top = state.cc[state.cc.length - 1]
        if (top == expression || top == expressionNoComma) state.cc.pop()
      }
    };
  });

  CodeMirror.registerHelper("wordChars", "javascript", /[\w$]/);

  CodeMirror.defineMIME("text/javascript", "javascript");
  CodeMirror.defineMIME("text/ecmascript", "javascript");
  CodeMirror.defineMIME("application/javascript", "javascript");
  CodeMirror.defineMIME("application/x-javascript", "javascript");
  CodeMirror.defineMIME("application/ecmascript", "javascript");
  CodeMirror.defineMIME("application/json", {name: "javascript", json: true});
  CodeMirror.defineMIME("application/x-json", {name: "javascript", json: true});
  CodeMirror.defineMIME("application/ld+json", {name: "javascript", jsonld: true});
  CodeMirror.defineMIME("text/typescript", {name: "javascript", typescript: true});
  CodeMirror.defineMIME("application/typescript", {name: "javascript", typescript: true});

});
